2

Following https://docs.substrate.io/tutorials/v3/ink-workshop/pt1/ , I run substrate-contracts-node --dev to start the node, but the Contract UI at https://contracts-ui.substrate.io/ shows Connection Error and cannot connect to Local Node, preventing contract deployment.

Any configuration to be changed ?

Running on Chrome, Apple M1 chip.

enter image description here

EDIT: it looks like a websocket connection error:

2022-04-22 14:50:15 Blocked connection to WebSockets server from untrusted origin: Some("https://paritytech.github.io")    

how can we allow the connection?

EDIT2: I've added --unsafe-ws-external to substrate-contracts-node command and Contract UI connects to LocalNode, but not sure this is the correct solution. (https://github.com/openethereum/parity-ethereum/issues/9678)

2
  • Can you add which browser you are using? Apr 22, 2022 at 6:49
  • @AlexanderTheißen running on Chrome , Apple M1 chip. Chrome error: WebSocket connection to 'ws://127.0.0.1:9944/' failed: connect @ polkadot.25fc112e.js:23
    – mastro
    Apr 22, 2022 at 6:56

1 Answer 1

1

this error happens when the local node is not ran in development mode - need to run substrate-contracts-node --dev (https://github.com/paritytech/substrate-contracts-node/issues/50)

the problem was that I was running the executable from https://github.com/paritytech/substrate-contracts-node/releases, that starts the node in Local Testnet (instead of dev)

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.